What evidence do I need for the NDIS?
To apply for the NDIS, you generally need evidence that shows you have a disability caused by a permanent impairment, that the impairment significantly affects your everyday life, and that you are likely to need support for your lifetime. A diagnosis on its own is usually not the whole picture. The NDIA looks at the impairment and its impact, not just the name of a condition. Only the NDIA decides eligibility.
If that sounds like a lot, take a breath. Most people already hold more of this than they think. The point of this guide is to help you understand what evidence you need for the NDIS in plain terms, so you can look at your own documents and see roughly where they stand.
A diagnosis is part of it, not all of it
It is easy to assume that a diagnosis letter is enough. Sometimes a diagnosis is an important piece. But the NDIA’s disability requirements ask for more than a label. They ask for evidence that the impairment behind the disability affects your daily life, and that it is expected to continue.
In the NDIA’s own words, to meet the disability requirements there needs to be evidence that your disability is caused by a permanent impairment, that the impairment significantly affects your life and your ability to do everyday tasks, and that you will likely need NDIS supports for your lifetime. You can read this directly on the NDIA page about the NDIS disability requirements.
An impairment is a significant change in your body’s functions, your body’s structure, or how you think and learn. It needs to be one or more of intellectual, cognitive, neurological, sensory or physical. The NDIA also says the cause does not matter. You could have had the impairment from birth, or from an injury or a health condition. What matters is the impairment and its effect.
What your evidence usually needs to show
Pulling the requirements together, evidence for the NDIS usually needs to describe a few things.
- The impairment. What it is, and where it fits (intellectual, cognitive, neurological, sensory or physical).
- Whether it is likely permanent. Evidence that you will likely have the impairment for your whole life. It is okay if the impact goes up and down, or comes in episodes. The NDIA usually considers permanence after available and appropriate treatment options have been considered.
- The impact on everyday life. How the impairment substantially reduces your ability to do daily activities like communicating, socialising, learning, moving around, looking after yourself and managing your life.
- Likely lifetime support. That you are likely to need NDIS supports over your lifetime, even if your needs go up and down.
Notice the theme. It is about the impairment being expected to continue, and about how it shapes ordinary daily tasks. Supports are described as things that help manage the impact and build capacity in daily life, not as anything that removes the disability.
Who your evidence comes from
Evidence usually comes from the treating health professionals who already know you. The NDIA gives common examples, including a GP, paediatrician, occupational therapist, speech pathologist, neurologist, psychologist, psychiatrist and physiotherapist. The professional who provides the main evidence should be the most appropriate person for your primary disability, which is the impairment that affects your daily life the most.
You do not always need a brand new report. The NDIA says evidence can be existing reports, assessments or letters that show the impact of your disability. That is why it is worth gathering what you already have before assuming you need to start again. For more on the features the NDIA looks for, see our guide to what counts as good evidence of disability.
You probably already hold more than you think
Old assessments, discharge summaries, school reports, therapy notes and GP letters can all carry useful detail. A report written for another purpose might still describe daily impact clearly. The task is less about producing something new and more about seeing what your existing documents already show, and where a short written confirmation from a treating professional might fill a gap.
A note on children. Children younger than 9 use the early childhood approach, and developmental delay applies for children younger than 7. If this is your situation, the starting points and supports are a little different.
A calm way to see where you stand
If you want a clearer sense of what your documents show, our NDIS evidence checklist walks through it step by step. It also helps to understand the underlying rules, which we cover in the NDIS disability requirements explained. You can also browse all of our NDIS evidence guides.
When you are ready, our Evidence Alignment report reads the documents you already hold against the current rules and shows where your evidence appears to be strong and where it might be strengthened. It is a way to see where you stand, not a decision about your access. Only the NDIA decides that.
Frequently asked questions
Do I need a formal diagnosis to apply for the NDIS?
The NDIA looks at whether you have a disability caused by a permanent impairment and how it affects your daily life, not a diagnosis on its own. A diagnosis can be part of the evidence, but the impairment and its impact are central. Only the NDIA decides eligibility.
Can I use reports I already have?
Yes. The NDIA says evidence can be existing reports, assessments or letters that show the impact of your disability. It is worth gathering what you already hold before assuming you need something new.
Who should write my evidence?
Usually a treating health professional who is the most appropriate person for your primary disability, and who has treated you for a significant period. Common examples the NDIA lists include a GP, paediatrician, occupational therapist, speech pathologist, psychologist and psychiatrist.
What does "permanent impairment" mean?
It means there is evidence you will likely have the impairment for your whole life. The impact can go up and down or come in episodes. The NDIA usually considers permanence after available and appropriate treatment options have been considered.